Lapping and grinding device



April 22, 1930. .1. w. oMEY LAPPING AND GRINDING DEVICE Filed Nov. 2,1927 wus yz5 f ParenteaeApr. la?, 1930 UNITED STATES PATENT ol-'FlcEJOHN W. OMEY, OF DETROIT, MICHIGAN, ASSIGNOR TO PACKARD MOTOR CAR COM-PANY, oF DETROIT, MICHIGAN,

A CORPORATION F MICHIGAN LAPPING AND @BINDING DEVICE Application ledNovember 2, 1927. Serial N'o. 230,431.

This invention relates to lapping and grinding devices and moreparticularly to grinding devices for finishing cylindrical apertures.

It has been the practice heretofore to provide a plurality of radiallyadjustable abrading members for lapping or grinding cylinders. Theabrading ymembers usually comprise grinding stones lor bars of lappingmetal used with an abrading compound and are member and a readilygenerally mounted on supports whichv in the past have not provenentirely satisfactory because the abrading members have not beensupported with suilicient rigidity to prevent warping, bending and otherinjury thereto, and the supports are also found lacking in adequatemeans for mounting and demounting the abrading members.

In some instances the abrading members are mounted on supports in leador other soft metal cast as binders to secure the abrading members inposition. In such cases the matter of replacement and repair causesconsiderable annoyance and unnecessary delay, since in dismounting theabrading members it becomes necessary to melt the metallic binders inwhich they are set, andin mounting to position the abrading members inthe supports and cast the binders. By this method the supports becomewarped and distorted due to the constant heating thereof and are thusrendered worthless. The present invention aims to overcome theseobjectionable features by providing a suit-able support demountableabrading member.

An object of the invention is to provide suitable support means forabrading members for lapping or grinding cylinders.v

Another object of the invention is -.to provide a lapping or grindingdevice for. grinding or finishing cylinders having readily demountableabrading members.

Yet another object of the invention is to provide a lapping or grindingdevice for grinding or finishing cylinders having a plurality ofradially adjustable supports each .carrying an abrading member which maybe easily and quickly removed or replaced.

A further object of the invention is to provide a lapping or grindingdevice for grinding cylinders comprising support members each carrying ademountable interlocking abrading member which may be easily and quicklyremoved or replaced.

Another object of the invention is to proyide a lapping or ygrindingdevice for grind- Ing or finishing cylinders and to constructsuch deviceso that the grinding or abrading members are supported parallel to theaxis of the working head and are radially adjustable with respectthereto.

A still further object of the invention is to provide a lapping orgrinding device for grinding or finishing cylinders, which is highlyeilicient in operation and yet of marked simplicity as a whole and inrespect to each of itsy component oparts so that its manufacture iseconomically facilitated both as to parts and their assembly.

Other objects of the invention will appear from the followingdescription taken in connection with accompanying drawings, which form apart of this specification, and in which:

Figure 1 is a side elevation illustrating the abrading members inposition;

Figure 2 is a vertical sectional View;

Figure '3 is a top plan view; and

Figure 4 is an enlarged detail View of one of the abrading members.

Referring by numerals to the drawings, l0 represents a working headcomprising a cylindrical body having a plurality of radial bosses 11arran ed in pairs and bored normal to the axis of t e head as indicatedat 12, to receive arms 13 spotwelded or otherwise secured or formed uponsupport members 14.

The arms 13 are normal to the support memmembers do not fit in thechannels perfectly,

' gibs or shims are employed and backed by the screws 20. The abradingmembers are further secured in position by screws 20 mountedtransversely in the flanges 16 adjacent to the respective endsof thelapping or abrading members. These screws serve to clamp the flanges 16upon the bevelled edges of the lapping or abrading members, the backportions of the support members yielding suiciently for this purpose. Asshown, the screws 20 have mounted thereupon sleeves 21, which engage therespective ends of the abrading members to prevent lateral movelnentthereof, the sleeves being provided'with lugs 22 fitting in notches 23in the ends of the support members and bent or curved to form hooks 24for the receptionof a spring 25 adapted to retain the radial arms 11 inengagement with adjusting members mounted in the working head, to behereinafter described.

'lhe working head 10 is provided with a central bore 26 mounted in eachend of which is a cylindrical member 27 having a conical portion 28.These members are positioned in reverse with respect to each other, withtheir conical portions opposite the radial bores 12 to provide abutmentsfor the arms 13. As shown, the members 27 are centrally bored asindicated at 29 and one of these members is internally threaded as at30. A shaft 31 is mounted into the threaded portion 30 in one of themembers 27 and extends through the bore in the other member 27 and isprovided with a head 32 fitting in a recess 33, a coil spring 34 beingmounted upon the shaft 31 between the members 27 to retain them inspaced relation.

The head 32 on the shaft 31 has pivotally connected thereto an extensionshaft 35 which passes through an elongated sleeve or tubular member 36pivotally connected to the upper end of the working head 10 by a collar37. The tubular member 36 is provided with a cap 38 through which theshaft 35 extends to provide adjustment of the members 27. As shown, thecap 38 is provided with trunnions 39 or other means may be employed forconnecting the working head to suitable motor power for impartingreciprocating and rotating motion thereto.

By rotating the shaft 35 and accordingly the shaft 31 swivelled thereto,the members 27 will be moved away from or toward each other and in soadjusting these members the radial arms 13 on the support members 111carrying the abrading members are moved radially inwardly or outwardlyaccording to the direction in which the shaft 31 is rotated. Itis,therefore, apparent that since the abrading members may be adjustedradially, the device is adaptable for., grinding cylinders of varioussizes within the limits of the capacity of the device. The device isadjustable for cylinders having the same diameter from end to end, orcylinders having a tapering or conical wall and that by reason of theparticular structure of the supports for the lapping or abradingmembers, the matter of re placement and repa'irs ofthe lapping orabrading members may be readily and quickly accomplished, since byremoving the transverse screws positioned at the respective ends ofthesupports the lapping or abrading members can be easily removed andreplaced.

Although this invention has b'een described in connection with certainspecific embodiments, the principles involved are susceptible v ofnumerous other applications that will readily occur to persons skilledin the art. j

The invention is therefore limited only as in v dicated by the scope ofthe appended claim.y

Having described the various features of the invention, what I' claimand desire to secure by Letters Patent, is

A grinding device comprising a working head having 'central and radialbores, a sleeve connected to said working head, an adjustment mechanismin the' central bore of the working head, an extension shaft connected`to the adjustment mechanism, said shaft eX- tending through and beyondthe sleeve and provided with means for operating the ad-v

